Re: KLIPSCH KSW-10 amplifier

Thanks for correcting me, it's the first time I see such topology of power regulator.
Yeah my circuit is probably wrong, I forgot to mention I didn't check at the transistors orientation and parts number. Also diodes are actually ~15V zener.

I changed cap, it's working so far. I don't think that fixed the source of the issue since the transistor zone is still warming up, specially on the negative side. At least my subwoofer is now consistently working. (For how long?)

Here's the hopefully fixed schematic:
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Re: KLIPSCH KSW-10 amplifier

Hi, I know this post is old but I've got the same issue and I did some reverse engineering so I thought I would share knowledge:





My conclusion is bad caps. 47uF ones (C35, C36, C37, C38). I couldn't get the part number of the transistor/mosfets but my guess's the caps smooth the voltage ripple at the gates. Since their capacitance is lowered because they're old, the mosfet's ripple increase and cause them to heat.
I will validate this theory tomorrow when I change these 4 caps....